Provide hooks to install per-syntax group methods

Change-Id: I205f94aab63d81d4e36a7964e3d8e9651b53e595
Create Seconds property in time objects

Change-Id: I16b643eff108df83a0f96354380b694912038645
Sign builds and update AssemblyInfo

Change-Id: I151126cdfcb0e3d3639b99302bd84798f26eb1e2